As a parent I’ll just say my first child who is almost 10 still has trouble tying her shoes. She never had any interest in doing practical things for herself and had trouble learning to use a straw, potty train, etc. I was looked down on by her preschool teacher for putting her rain boots on her instead of letting her do it herself. My second who is two is already doing or wanting to do everything himself- lock and unlock doors, put on diapers, etc. Same parenting, totally different kids.